* {
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav {
    display: flex;
    /* justify-content: center; */
    justify-content: space-between;
    align-items: center;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
}

.nav_center {
    display: flex;
    justify-content: space-around;
    width: 300px;
    height: 100%;
    margin-left: -840px;
}

.jianjie {
    display: none;
}

.gr:hover .jianjie {
    display: block;
}

.userinfo {
    margin-right: 50px;
}

.h4 {
    font-size: 18px;
    color: aquamarine;
    margin: 10px 90px 10px 30px
}

.left_nav {
    display: flex;
    width: 175px;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
}

.left_nav_araticle {
    width: 175px;
    height: 600px;

    /* background: rgba(0, 0, 0, 0.8); */
}

.nav_araticle {
    width: 100%;
    height: 600px;
    color: white;
}

.araticle_1 {
    display: flex;
    flex-wrap: wrap;
}

.araticle_1 li {
    margin: 5px 20px;
    width: 150px;
    height: 30px
}

.lunbotu {
    width: 100vh;
    height: 200px;
}

.lunbotu img {
    width: 100vh;
    height: 200px;

}